Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 ccc8a0de2e6b417e…

MALICIOUS

Office (OLE) / .XLS

95.5 KB Created: 2020-04-23 12:26:24 Authoring application: Microsoft Excel
MD5: f2681de48a0bd4f6182c214a5173a1b7 SHA-1: 12480bf227921636fae1b5edee17a18c3b57e3b8 SHA-256: ccc8a0de2e6b417e3437082098d2ca6a93968db1480394d2d2512ecb6b16f192
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristic firings. The encrypted nature and the presence of XLM macros suggest an attempt to hide malicious execution, commonly used for initial payload delivery or system compromise.

Heuristics 2

  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

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